Hi Ingrid....I just googled, found the link to the manufacturer, copied below. It's an interesting article, will be looking into this product more as my husband heads into radiation in a few weeks. Ana

P.S. I wish I could be with you and Eric on the walk tomorrow, especially as ya'll are just down the road. Instead, I'll be taking Vince for his neulasta shot (love whoever invented that stuff!) & giving him his home IV as this is a particularly rough chemo week. All 4 of us will be there next year, stronger than ever...:) Hugs to both of you and thank you for walking for all of us!